/**
 * Created with IntelliJ IDEA.
 * Description:计算1/1-1/2+1/3-1/4+1/5 …… + 1/99 - 1/100 的值
 * User: xwl
 * Date: 2023-04-02
 * Time: 16:41
 */
public class Test1 {
    public static void main(String[] args) {
        double sum = 0;
        int flag = 1;
        for (int i = 1; i <= 100; i++) {
            sum += 1.0/i*flag;
            flag *= -1;
        }
        System.out.println(sum);
    }
}
